Frequent Crashes

I've used Fusion for over a month with no problems, but today, it is constantly crashing. It's not even a very complicated comp (not yet, anyway), but it will just shut down without warning, sometimes within two minutes of opening. As far as I know, it hasn't updated, and I can't think of anything else I've changed on my computer that might have suddenly caused the problem. Up to now, I've been very happy with Fusion, but this is getting maddening.

Try Ctrl-Shift-H?

Try a memory checking utility (for example: use a Linux bootable pendrive).

Fusion is very intensive in memory usage and a defective memory can cause a crash.